Another Sims 2 Problem

When I tried to install the Sims 2 (on windows vista), it would go about a second and a half before giving me this message: A problem occurred when trying to transfer the file D:\TSData\Res\sims3D\Sims08.package from the media. Do you want to retry? I retry, the message instantly pops up again, whatever.

I found a thread on here in which the same problem was presented and help was given. That is not my problem. ZEUS_GB explained how to manually install the Sims 2 by copying the contents of the CDs into Disk Images folders in My Computer.

So now I'm manually installing. Anyway, I was copying the contents of the CDs to the Disk Images folders, and the first 2 disks went fine, but the third one gets almost finished copying and then a message pops up showing the "compressed" folder that is supposed to be copied and says "Invalid MS-Dos function" and gives me three options: Try Again, Skip, or Cancel. Click Try Again, same problem. Eject disk, try again, same problem.

I moved on to the fourth disk, and again it copied perfectly. Went back and tried the third disk again: no good. The compressed folders on the other disks copied fine, and the disk is in good condition, so I'm totally confused as to why the third one should be any different from the others. Help!